As it turns out, the readings are indeed accurate (not an anomaly), we know this due to the fact that the gas has spread out over the past 5 days since the event occurred on February 25th into 26th.

Over the course of 5 days since the event occurred, the gas spread Eastward towards the midwest United States, following actual measured wind currents – proving a gas was indeed detected – proving the gas is moving with the prevailing surface winds.

Here is a screenshot of the gas 1 day after the release, fanning out across the areas to the East as the wind carried the gas towards the Rocky Mountains.

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The next day, on February 28th, after the gas reached the Rocky Mountains, it then further spread out across the Midwest United States — again following prevailing wind currents.

The progression of the gas is obvious.

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By day three, on February 29th, the gas has reached the low pressure system over the Northern United States, and is quickly mixed with heavy winds – dissipating the gas towards the East Coast of the US.